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Numbers not divisible, Numbers having two factors 1, number by whole numbers, Numbers obtained by multiplying that, Numbers having more than 2 factors, numbers differ by 2 eg (3,5,7), E.g. Multiples of 4 = 4, 8, 12, 16, 20, 24, Multiples of 6 = 6, 12, 18, 24 ..., Common multiples = 12, 24, Lowest common, eg Factor of 12 = 1, 2, 3, 4, 6, 12, Highest common, factor (H.C.F), multiple (L.C.M), Factor of 16 = 1, 2, 4, 8, 16, Common factors = 1, 2, 4, MIND MAP, LC.M. = 12., HC.F = 4., Factor, Even numbers, Multiples, Numbers divisible by 2, eg 2,4,6,8.10..., eg. Factor of 24 are, 1,2, 3, 4, 6, 8, 12, 24., Twin prime, eg. multiples of 6 are, 6, 12, 18, 24, 30, 36 ., Playing, Coprime, Odd numbers, With, eg (3,5) (5,7), Numbers, Divisibility tests, 2 numbers having only 1 as, and itself eg 2.3,5,7..., Prime numbers, eg 4,6,8,9,.., by 2,3,4,5,6,8,9,10,11, A number is divisible :, Composite, By 2 If unit digit is 0,2,4,6 or 8., By 3 If sum of digits is divisible by 3., By 4 The number formed by last 2 digits is double zero or divisible by 4., numbers, Prime triplet, By 5, If the unit digit is U or 5., Cat of 3 consecutive prime, 2 consecutive odd prime, bers differ by 2 eg (3,5.7, Eхact, t divisor of, that, number, Set of 3 consecutive prime